<form id="form1" name="form1" method="post" action="prestamoProcess">
  <table width="459" border="0" align="left">
      <tr>
        <td width="181" align="left">Libro</td>
        <td width="268" align="left">
          <select name="txtID" id="txtID">
          <?php
            
            foreach ($catalogo as $titulo)
            {
              echo "<option value='" . $titulo['idCatalogo'] ."'>" . $titulo['Titulo'] . "</option>";
            }    
          ?>
          </select>
        </td>
      </tr>
      <tr>
        <td align="left">Fecha de Prestamo (dd/mm/aaaa)</td>
        <td align="left"><span id="sprytextfield2">
        <input type="text" name="txtFechaPrestamo" id="txtFechaPrestamo" value="<?php echo $fechaHoy; ?>" />
        <span class="textfieldRequiredMsg">Se necesita un valor.</span><span class="textfieldInvalidFormatMsg">Formato no válido.</span></span></td>
      </tr>
      <tr>
        <td align="left">Fecha de devolución (dd/mm/aaaa)</td>
        <td align="left"><span id="sprytextfield2">
        <input type="text" name="txtFechaDevolucion" id="txtFechaDevolucion" value="<?php echo $fechaDevolucion; ?>" />
        <span class="textfieldRequiredMsg">Se necesita un valor.</span><span class="textfieldInvalidFormatMsg">Formato no válido.</span></span></td>
      </tr>
      <tr>
        <td align="left">Tipo de préstamo</td>
        <td align="left"><select name="ddlTipoPrestamo" id="ddlTipoPrestamo">
          <option value="1">Normal</option>
          <option value="2">Vacaciones</option>
        </select></td>
      </tr>
      <tr>
        <td align="left">&nbsp;</td>
        <td align="left"><input type="submit" name="btnGuardar" id="btnGuardar" value="Guardar" /></td>
      </tr>
    </table>
</form>
